Hydraulically operable transmission

Details Hydraulically operable transmission Hydraulically operable transmission

1990-09-10

1991-12-17

Lorence, Richard

192 clutches and power-stop control

Transmission control and clutch control

Common control

192 52, 192 85R, 192109F, B60K 4122, F16D 2514

Patent

active

050728148

ABSTRACT:
A hydraulically operable transmission comprises change speed gears, a hydraulic clutch, and a hydraulic circuit for operating the change speed gears and hydraulic clutch. The hydraulic circuit includes a plurality of hydraulic actuators interlocked with the change speed gears, and a pilot type control valve for controlling the hydraulic actuators. An oil line leading to the hydraulic clutch includes a pressure increase adjustor for adjusting pressure increase characteristics when the hydraulic clutch is engaged. The pressure increase adjustor includes, arranged parallel to one another, a normally open first switch valve closable when a secondary hydraulic pressure exceeds a first set level, a normally closed second switch valve openable when the secondary hydraulic pressure exceeds a second set level higher than the first set level, and a restrictor. The first switch valve is urged toward an open position by a spring whose urging force is increased when the control valve is operated to a high speed range.

REFERENCES:
patent: 4046162 (1977-09-01), Rodeghiero
patent: 4465168 (1984-08-01), Sato
patent: 4646519 (1987-03-01), Inagaki et al.
patent: 4711329 (1987-12-01), Hasegawa et al.
patent: 4924983 (1990-05-01), Katayama et al.
patent: 4949264 (1990-08-01), Katayama et al.

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